The smell of freshly cut grass is actually a plant distress call.
31
A cesium atom in an atomic clock beats over nine billion times a second.
43
In zero gravity, a candle's flame is round and blue.
16
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
The Manchineel Tree is so poisonous, rainwater dripping off it’s leaves will burn your skin.
17
The average home creates more pollution than does the average car.
33